#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n,m; cin>>n>>m;
int s,t,u,v; cin>>s>>t>>u>>v;
vector<vector<pair<int,int> > > vv(n+5);
for (int i=0;i<m;i++) {
int a,b,c; cin>>a>>b>>c;
vv[a].push_back({b,c});
vv[b].push_back({a,c});
}
int diss[n+5],dist[n+5],disv[n+5],par[n+5];
for (int i=0;i<=n;i++) {
diss[i]=dist[i]=disv[i]=1e18; par[i]=-1;
}
priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > > q;
q.push({0,s}); diss[s]=0; par[s]=s;
while (!q.empty()) {
int c=q.top().first,i=q.top().second;
q.pop();
if (c>diss[i]) continue;
for (int j=0;j<vv[i].size();j++) {
int ii=vv[i][j].first,cc=vv[i][j].second;
int nwc=c+cc;
if (diss[ii]>nwc) {
diss[ii]=nwc;
q.push({nwc,ii});
par[ii]=i;
}
}
}
int indx=t;
while (indx!=s) {
for (int i=0;i<vv[indx].size();i++) {
if (vv[indx][i].first==par[indx]) vv[indx][i].second=0;
}
for (int i=0;i<vv[par[indx]].size();i++) {
if (vv[par[indx]][i].first==indx) vv[par[indx]][i].second=0;
}
indx=par[indx];
}
q.push({0,v}); disv[v]=0;
while (!q.empty()) {
int c=q.top().first,i=q.top().second;
q.pop();
if (c>disv[i]) continue;
for (int j=0;j<vv[i].size();j++) {
int ii=vv[i][j].first,cc=vv[i][j].second;
int nwc=c+cc;
if (disv[ii]>nwc) {
disv[ii]=nwc;
q.push({nwc,ii});
par[ii]=i;
}
}
}
if (s!=u) {
cout<<disv[u]; return 0;
}
q.push({0,t}); dist[t]=0;
while (!q.empty()) {
int c=q.top().first,i=q.top().second;
q.pop();
if (c>dist[i]) continue;
for (int j=0;j<vv[i].size();j++) {
int ii=vv[i][j].first,cc=vv[i][j].second;
int nwc=c+cc;
if (dist[ii]>nwc) {
dist[ii]=nwc;
q.push({nwc,ii});
par[ii]=i;
}
}
}
int ans=1e18;
for (int i=1;i<=n;i++) {
if (diss[i]+dist[i]==diss[t]) {
ans=min(ans,disv[i]);
}
}
cout<<ans;
}
